The B012MD5S from Knowles is a Band Pass Filter with Frequency 1.22 to 1.234 GHz, Bandwidth 10 MHz, Center Frequency 1.227 GHz, Insertion Loss 3.5 to 4.2 dB, Rejection 40 to 50 MHz. Tags: Surface Mount, Ceramic Filter. More details for B012MD5S can be seen below.